feat: invert boolean logic

apps/docs/src/concepts/unminify.md

@@ -27,6 +27,23 @@ console.log(a); // [!code ++]
 Infinity // [!code ++]
 ```
 
+## invert-boolean-logic
+
+```js
+!(a == b) // [!code --]
+a != b // [!code ++]
+```
+
+```js
+!(a || b || c) // [!code --]
+!a && !b && !c // [!code ++]
+```
+
+```js
+!(a && b && c) // [!code --]
+!a || !b || !c // [!code ++]
+```
+
 ## json-parse
 
 ```js

packages/webcrack/src/unminify/test/invert-boolean-logic.test.ts

@@ -0,0 +1,34 @@
+import { test } from 'vitest';
+import { testTransform } from '../../../test';
+import invertBooleanLogic from '../transforms/invert-boolean-logic';
+
+const expectJS = testTransform(invertBooleanLogic);
+
+test('loose equal', () =>
+  expectJS('!(a == b);').toMatchInlineSnapshot(`a != b;`));
+
+test('strict equal', () =>
+  expectJS('!(a === b);').toMatchInlineSnapshot(`a !== b;`));
+
+test('not equal', () =>
+  expectJS('!(a != b);').toMatchInlineSnapshot(`a == b;`));
+
+test('not strict equal', () =>
+  expectJS('!(a !== b);').toMatchInlineSnapshot(`a === b;`));
+
+test('greater than', () =>
+  expectJS('!(a > b);').toMatchInlineSnapshot(`a <= b;`));
+
+test('less than', () => expectJS('!(a < b);').toMatchInlineSnapshot(`a >= b;`));
+
+test('greater than or equal', () =>
+  expectJS('!(a >= b);').toMatchInlineSnapshot(`a < b;`));
+
+test('less than or equal', () =>
+  expectJS('!(a <= b);').toMatchInlineSnapshot(`a > b;`));
+
+test('logical or', () =>
+  expectJS('!(a || b || c);').toMatchInlineSnapshot(`!a && !b && !c;`));
+
+test('logical and', () =>
+  expectJS('!(a && b && c);').toMatchInlineSnapshot(`!a || !b || !c;`));

packages/webcrack/src/unminify/transforms/index.ts

@@ -1,6 +1,7 @@
 export { default as blockStatements } from './block-statements';
 export { default as computedProperties } from './computed-properties';
 export { default as infinity } from './infinity';
+export { default as invertBooleanLogic } from './invert-boolean-logic';
 export { default as jsonParse } from './json-parse';
 export { default as logicalToIf } from './logical-to-if';
 export { default as mergeElseIf } from './merge-else-if';

packages/webcrack/src/unminify/transforms/invert-boolean-logic.ts

@@ -0,0 +1,71 @@
+import * as t from '@babel/types';
+import * as m from '@codemod/matchers';
+import { Transform } from '../../ast-utils';
+
+const INVERTED_BINARY_OPERATORS = {
+  '==': '!=',
+  '===': '!==',
+  '!=': '==',
+  '!==': '===',
+  '>': '<=',
+  '<': '>=',
+  '>=': '<',
+  '<=': '>',
+} as const;
+
+const INVERTED_LOGICAL_OPERATORS = {
+  '||': '&&',
+  '&&': '||',
+} as const;
+
+export default {
+  name: 'invert-boolean-logic',
+  tags: ['safe'],
+  visitor: () => {
+    const logicalExpression = m.logicalExpression(
+      m.or(...Object.values(INVERTED_LOGICAL_OPERATORS)),
+    );
+    const logicalMatcher = m.unaryExpression('!', logicalExpression);
+
+    const binaryExpression = m.capture(
+      m.binaryExpression(m.or(...Object.values(INVERTED_BINARY_OPERATORS))),
+    );
+    const binaryMatcher = m.unaryExpression('!', binaryExpression);
+
+    return {
+      UnaryExpression: {
+        exit(path) {
+          const { argument } = path.node;
+
+          if (binaryMatcher.match(path.node)) {
+            binaryExpression.current!.operator =
+              INVERTED_BINARY_OPERATORS[
+                binaryExpression.current!
+                  .operator as keyof typeof INVERTED_BINARY_OPERATORS
+              ];
+
+            path.replaceWith(binaryExpression.current!);
+            this.changes++;
+          } else if (logicalMatcher.match(path.node)) {
+            let current = argument;
+            while (logicalExpression.match(current)) {
+              current.operator =
+                INVERTED_LOGICAL_OPERATORS[
+                  current.operator as keyof typeof INVERTED_LOGICAL_OPERATORS
+                ];
+
+              current.right = t.unaryExpression('!', current.right);
+              if (current.left.type !== 'LogicalExpression') {
+                current.left = t.unaryExpression('!', current.left);
+              }
+              current = current.left;
+            }
+
+            path.replaceWith(argument);
+            this.changes++;
+          }
+        },
+      },
+    };
+  },
+} satisfies Transform;